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Exploring Junctions of Filamentary Structure with SUZAKU Hajime Kawahara (TMU)

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Presentation on theme: "Exploring Junctions of Filamentary Structure with SUZAKU Hajime Kawahara (TMU)"— Presentation transcript:

1 Exploring Junctions of Filamentary Structure with SUZAKU Hajime Kawahara (TMU)

2 ~ 80 % of Baryons is still missing Stars in Galaxies ~ 10 % Hot gases in Galaxy Clusters ~ 10 %

3 FOV is so small 70 Mpc Simulated Universe ( Takei+ 2011) Assuming @z=0.1 Galaxy clusters Detectable by Low sensitivity sky surveys Field of View of High sensitivity Satellites

4 Suzaku search for emission from missing baryons Nearby of a massive cluster Akamatsu+2011 Middle of two massive clusters Mitsuishi+2011 No missing baryon was found.

5 SDSS galaxy map

6 RA DEC Points: SDSS spectroscopic galaxies Curves: DisPerSE : filament extractor Sousbie 2011, Sousbie, Pichon, & Kawahara 2011 Points: SDSS spectroscopic galaxies Curves: DisPerSE : filament extractor Sousbie 2011, Sousbie, Pichon, & Kawahara 2011 Kawahara+ApJL 2011 z

7 Massive Cluster A2142 Rosat All Sky Survey

8 The referee might need courage to accept the observation of “blank fields” $ 30 billion (total)/ 5 years x 80 ksec = $ 0. 15 million for “blank field” ! Thank you very much for accepting

9 Massive Cluster A2142 Rosat All Sky Survey

10 Kawahara, Yoshitake, Nishimichi & Sousbie ApJL, 727, L38 (2011) X-ray Brightness 0.5-5 keV (10 4 cnt/s/cm2/sr) Hardness Ratio H=0.4-1.1,S=1.1-2.0 keV Optical image (DSS)

11 1.64 +0.35 −0.11 (STAT) ±0.05 (SYS) keV 3.91 +1.06 -0.75 (STAT) ±0.28 (SYS) keV Merging group Suzaku J1552+2739

12 Anderson+2009 500 kpc redshift Bullet cluster Suzaku J1552+2739 A1750 A2142 A1758

13 Massive Cluster A2142 Merging Galaxy Group Suzaku J1552+2739 9 keV 1.6 keV Suzaku J1552+2739 is not WHIM ( < 1 keV ) But was Missing Baryon

14 In 2011 (Suzaku AO-6 period)

15 How to select the targets ? In 2011 (AO6) DisPerSe + SDSS DR7 3D Structure X-ray Map (RASS) BCG like galaxy

16 Sekiya, HK + in prep Junction 1 Junction 2 Junction 3 T ~ 0.7 keVT ~ 1.3 keV T ~ 0.7 keV ? Preliminary results of 3 new junctions Hardness Ratio (0.5-1 & 1-5 keV)

17 XMM If observing good positions, even current satellites can glance the low-T missing world of the Universe Star: major merger Conclusions local universe ROSAT Chandra

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